You're rightfully getting downvoted because having a passenger is not at all a given and before the days of navigation systems you had to handle physical maps at the next red light or pull over, but there's a kernel of truth to your statement:

A passenger who can actually navigate is a godsend. I learned how to do it properly during my draft time (civil defence) and a proper navigator takes so much load off the driver it's not funny any more. Incomparable to a computer navigation system. The driver is getting instructions exactly when necessary, confusing situations get called out and clarified, and when the driver makes a call "can't drive left here" it's the navigator's responsibility to re-plan. You can actually focus on the road because the navigator takes on full responsibility for the route. It's how you can get fast to a place in an area unknown to both driver and navigator, and with "fast" I mean with or without sirens, without that navigator backup sirens would generally be pointless, no brain cycles left to care about routes when you're "breaking" rules of the street and dealing with apparently deaf and blind drivers left and right.

The average passenger, though, is magnitudes worse than computer navigation. And I don't just mean people who need to rotate the map to not get disoriented, I mean practically everyone.